אל תשפכי את כל החלב לסיר; תשפכי רק קצת.

In Hebrew, negative commands are usually formed with אל + a future-tense verb.

So:

• אל תשפכי = Don’t pour
• לא תשפכי would normally sound more like you will not pour or you don’t pour, not a direct command.

So אל is the normal word for telling someone don’t do that.

Great question. The same verb form can be used in two slightly different ways here:

• אל תשפכי = negative command: don’t pour
• תשפכי רק קצת = a positive command in a common modern spoken style: pour only a little

In other words, the second תשפכי is formally a future form, but in Modern Hebrew future forms are often used like commands, especially in everyday speech.

A more traditional textbook imperative would be:

• שפכי רק קצת

So the sentence is using a very common modern pattern:

• אל + future for don’t...
• sometimes just future for do...

It shows that the sentence is addressed to one female.

So תשפכי means you (feminine singular) will pour / pour.

Compare:

• תשפכי = you, one woman/girl
• תשפוך = you, one man/boy

So this whole sentence is being said to a female listener.

את is the marker of a definite direct object.

Hebrew uses את before a direct object when that object is definite, such as:

• a noun with ה-
• a name
• a pronoun
• a phrase that is definite for some other reason

Here the direct object is כל החלב = all the milk.
Because החלב is definite (the milk), the whole phrase is definite, so Hebrew adds את:

• את כל החלב

This את does not mean with here. It is just a grammar marker.

In Hebrew, כל usually comes before the noun:

• כל החלב = all the milk
• כל הספרים = all the books

When the noun after כל is definite, the whole phrase is definite.

So:

• כל חלב = all milk / milk in general
• כל החלב = all the milk

That is why the sentence says את כל החלב: it means a specific amount of milk already known in the situation.

לסיר means to the pot, and in this context naturally translates as into the pot.

It is made from:

• ל- = to
• סיר = pot

Because the noun is definite here (the pot), Hebrew combines the preposition with the definite article, so ל + הסיר becomes לסיר in normal spelling.

In context, English prefers into the pot, but Hebrew often uses ל- for movement toward a container or target.

קצת means a little or a bit.

In this sentence, the missing object is understood from context: it means a little of the milk.

So:

• תשפכי רק קצת = pour only a little

Hebrew often leaves out the repeated noun when it is obvious. English does the same sometimes:

• Don’t eat all the cake; eat just a little.

So nothing is missing grammatically; the meaning is simply understood from the previous clause.

It is very natural in modern everyday Hebrew, but some grammar books would point to the imperative form:

• שפכי רק קצת

So you may see two versions:

• שפכי רק קצת = the traditional imperative
• תשפכי רק קצת = very common modern spoken-style command

Both are understandable, but the future-form command is extremely common in real-life Hebrew.

You would use the masculine singular forms:

• אל תשפוך את כל החלב לסיר; תשפוך רק קצת.

A more traditional imperative in the second half would be:

• אל תשפוך את כל החלב לסיר; שפוך רק קצת.

So the key change is:

• feminine: תשפכי
• masculine: תשפוך